JPH10303605A - Isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make components small-sized and small in number, to obtain structure which hardly has a position shift due to soldering operation, and to improve the reliability by arranging a capacitance adjustment part for a semifixed capacitive element fixed to a metallic case so that it is exposed through a notch of the metallic case. SOLUTION: A laminate type capacitive element 9 is fitted erectly between the lower metallic case 1 of an isolator and the perpendicular part of a copper plate 4 and fixed by soldering. On the outermost layer surface of this capacitive element 9, a trimming pattern as a ground-side electrode is provided an the capacitive element 9 is so arranged that the above-mentioned surface is on the side of the case and a counter electrode as the opposite outermost layer surface is on the side of the copper plate 5. Windows 14, 15, and 16 are provided at places of the lower metallic case 1 where capacitive elements 6, 8, and 9 are expected to be arranged. The assembled isolator is adjusted to target characteristics by measuring the performance and trimming the capacitive patterns of the capacitive elements 6, 8, and 9 through window-shaped notches 14, 15, and 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact, lumped constant type isolator which is a component of a mobile communication device using microwaves.

[0002]

2. Description of the Related Art Non-reciprocal circuit devices such as isolators and circulators are used in mobile communication devices using a frequency band of several hundred MHz to several tens of GHz, that is, PHS (Personal Handy Phone) base stations and mobile phone terminals. Is often used. This element has a function of transmitting microwaves in the forward direction with low loss and blocking microwaves in the reverse direction. In addition, a portable device for mobile communication is required to have a structure that is small and resistant to vibration.

[0003] Small lumped-constant isolators include a permanent magnet, a microwave ferrite, a center conductor, a laminated capacitive element,
The resistance element and other members are provided in an iron case also serving as a yoke. This isolator is usually fine-tuned to complete a target characteristic specification at a specific frequency after completing the assembly work.

That is, the generated magnetic field of the permanent magnet is adjusted by magnetizing and demagnetizing operations, the capacitance is adjusted by trimming the electrode pattern of the capacitor, or the spacing between the wire rings of the air-core coil used together is adjusted. The usual method was to match the target characteristics. Regardless of the magnetic field adjustment or the capacity adjustment, a method has been adopted in which the isolator is once disassembled, adjusted, reassembled and checked for characteristics, and then disassembled and adjusted.

[0005] However, as long as such an adjusting means is employed, the variation caused by the assembling work has to be excluded from the adjustment, so that the precise adjustment has to be abandoned. Further, the isolator, in which the wire spacing of the air-core coil is adjusted after the assembling work, is liable to change its characteristics due to vibration, and is not practical in a portable device for mobile communication.

In order to improve the efficiency of the adjustment work and the accuracy of the adjustment, a hole is temporarily formed in the upper part of the metal case of the isolator, and the electrode pattern of the semi-fixed capacitor arranged horizontally is inserted through the hole. If the trimming is to be performed, the pattern of the capacitor must not be at least shadowed by a permanent magnet or the like, and therefore it is necessary to place the capacitor at a distance outside the permanent magnet. In other words, the size of the parts increases, and it is far from market demand. Further, the chips generated as a result of the trimming are scattered in the parts and cause a short circuit accident, which is a fatal defect in reliability. As a result, the above-described adjustment method is not practical at all.

Therefore, in order to adjust the performance variation to the target performance by the characteristic adjustment work, it is necessary to adjust the parts at the time of arranging the components using a great deal of time and labor. This has resulted in delays in automation of production, securing reliability, performance of parts, accuracy, price, etc. in the product field, and has been a major factor hindering the development of this product field.

[0008]

In view of such a situation, the problems to be solved by the present invention with respect to a small lumped constant type isolator are as follows.

That is, an object of the present invention is to provide an isolator for a mobile communication device which meets the following requirements. A structure that contributes to downsizing of components, a structure that reduces the number of components, a structure that does not easily cause displacement due to soldering work, and that is highly resistant to vibration and that improves reliability such as preventing short circuits. Preferably, the capacity adjustment is easy and precise. In addition, it has excellent performance and little variation,
A structure that contributes to automation of the manufacturing process, and contributes to improvement in productivity and production efficiency.

[0010]

As a result of intensive studies to solve the above-mentioned problems, the present inventors have conceived of an isolator having a significantly improved configuration. That is, a first invention is an isolator having a metal case of a ground potential, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitor, and a resistor, wherein the semi-fixed capacitor is fixed to the metal case. The metal case has a cutout portion, and the capacitance adjusting portion of the semi-fixed capacitance element is an isolator arranged to be exposed through the cutout portion.

According to a second aspect of the present invention, there is provided an isolator having a metal case having a ground potential, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, and a resistance element, wherein the semi-fixed capacitance element is fixed to the metal case. The metal case has a notch, and the capacitance adjustment portion of the semi-fixed capacitance element is arranged so as to be exposed through the notch, and the capacitance adjustment portion of the semi-fixed capacitance element is a ground-side electrode. The semi-fixed capacitive element is an isolator configured so that the capacitance adjusting means performs trimming of the ground electrode through the cutout.

According to a third aspect of the present invention, there is provided an isolator including a metal case having a ground potential, a permanent magnet, a center conductor, a microwave ferrite, a laminated capacitor, a resistor, and a conductor plate. An isolator arranged so that a lamination surface is parallel to a central axis of the microwave ferrite.

According to a fourth aspect of the present invention, there is provided an isolator including a metal case having a ground potential, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, and a resistance element, wherein the metal case has a cutout portion, The fixed capacitance element is configured such that the capacitance adjustment part is a ground side electrode, and the conductor plate is an external terminal of the isolator and is electrically connected to the center conductor and the opposite external electrode of the semi-fixed capacitance element. The configured isolator.

According to a fifth aspect of the present invention, there is provided an isolator including a metal case having a ground potential, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitor, a resistor, and a conductor plate, wherein the metal case has a cutout. The semi-fixed capacitive element has a capacitance adjustment portion serving as a ground electrode, the conductor plate serving as an external terminal of the isolator, the central conductor, one of the opposed external electrodes of the semi-fixed capacitive element, and one of the resistance elements. And the other electrode of the resistance element is fixed to and electrically connected to the metal case.

According to a sixth aspect of the present invention, there is provided an isolator having a metal case having a ground potential, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitor, a resistor, and a conductor plate, wherein the conductor plate is an external terminal of the isolator. And electrically connected to the central conductor and the external electrode on the opposite side of the semi-fixed capacitance element, and the conductor plate is formed integrally with resin, and the external terminal of the isolator and the central conductor And an isolator that is configured to be covered with the resin only at a portion of the semi-fixed capacitance element except for an electrical connection portion with the opposing external electrode.

A seventh aspect of the present invention is the isolator according to the sixth aspect, wherein the resin has a step, and the semi-fixed capacitance element is arranged in the step.

An eighth invention is the isolator according to any one of the sixth and seventh inventions, wherein the resin is disposed so as to be in contact with the outer periphery of the microwave ferrite.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a stacked capacitor having a trimming pattern is so-called vertically arranged.
That is, use it upright. Further, the trimming pattern is exposed on a window provided in a metal case also serving as a yoke, so that trimming can be actually performed through this window. The ground electrode of the stacked capacitive element is in contact with and electrically connected to the metal case of the isolator. In this structure, it is easier to form the trimming pattern on the ground electrode. That is, since extra wiring and insulation distance can be omitted, the requirement for miniaturization is met.

Further, the laminated capacitive element and the metal case are brought into close contact with each other except for the window. This prevents chips generated during trimming from adhering to other components through the window.

The electrode on the opposite side of the above-mentioned laminated capacitive element has 1
The two conductors are fixed, and both are electrically connected by, for example, soldering. This conductor is, of course, substantially vertical at the portion to be fixed. Although a copper plate is used as the conductor, the conductor is not limited to a copper plate.

The copper plate has a portion other than the portion to which the opposite-side electrode is fixed, and has a portion folded back so as to sandwich the extended portion of the center conductor, and the center conductor is temporarily fixed at this portion. Both are fixed with solder and electrically connected.
It is more convenient to keep this part of the conductor substantially horizontal.

The above-mentioned copper plate further includes
External electrodes of the isolator are formed. Although this portion of the copper plate is substantially horizontal, it is more convenient to provide the copper plate on a different plane from the folded portion. In other words, during this time, it is bent about twice.

The above-mentioned copper plate having at least three functional parts is integrally formed with a resin, and is formed so that a part of the copper plate excluding the functional part is covered with the resin. By adopting this method, the bending, distortion or deformation of the copper plate is prevented. Furthermore, the arrangement of the above-mentioned stacked capacitive element and the center conductor can be performed accurately and efficiently.

The resin has a vertical wall surface extending substantially on the same plane as a portion of the copper plate to which the opposing electrode is fixed. Furthermore, a horizontal plane perpendicular to the wall surface and extending to the nearest metal case side, and the length of the extended portion is substantially the same as or less than the lamination thickness of the laminated capacitive element. The above resin has.

The above-mentioned stacked capacitive element is arranged along these two orthogonal planes. In this stacked capacitive element, the ground electrode is just in contact with the inside of the metal case, and the center of the ground electrode is arranged at a position substantially coincident with the center of the window provided in the metal case.

Further, the integrally molded product of the copper plate and the resin is
The arrangement of the microwave ferrite is corrected by directly or via a center conductor on the outer periphery of the microwave ferrite. For this purpose, the resin molded product may be provided with a suitable concave portion.

Further, the integrally molded product of the copper plate and the resin is disposed at a position corresponding to the input / output port of the isolator. These two resin molded products may have a resin portion integrated.

Similarly, an integrated molded product of a copper plate and a resin, and a laminated capacitive element and a resistive element may be provided at a port connected to the resistive element of the isolator. Also in this case, these three resin molded products may have a resin portion integrated.

Furthermore, the present invention relates to an isolator, but can be easily changed to a three-terminal circulator except for the resistance element. Therefore, the isolator according to the present invention includes a three-terminal circulator.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on embodiments. FIG. 1 is an exploded perspective view of an isolator for explaining an embodiment of the present invention. FIG. 2 is an enlarged perspective view of the conductor (5) shown in FIG.

First, an integrally molded product of the copper plate (5) and the resin (2) was separately prepared, and fitted to the lower metal case (1). Subsequently, the ground portion of the center conductor (3) was put in the center hole of the above-mentioned integrally molded product, and soldered to the lower metal case (1). However, a copper ground plate may be arranged between the lower metal case (1) and the ground portion of the center conductor (3).

On the ground portion of the center conductor (3), a disc-shaped garnet (11), which is a microwave ferrite, is disposed in the center hole of the integrally formed article, and one of the center conductor (3) is provided. One terminal was bent so as to wrap the garnet (11) (the terminal of the central conductor (3) here includes a mesh portion). Subsequently, another terminal of the center conductor (3) was bent in the same manner, an insulating film made of polyimide was sandwiched between the terminal and the other terminal, and the same procedure was repeated to fold the remaining terminals.

The extending portion (10) of one terminal of the center conductor (3) is temporarily fixed by being sandwiched between folded portions (22) provided on one copper plate (5) of the above-mentioned integrally formed product, and then electrically connected with solder. Connected. Similarly, other terminals were connected to the folded portions of other copper plates.

Subsequently, the laminated capacitive element (9) was set up between the lower metal case (1) and the vertical portion (21) of the copper plate (5), and was fixed by soldering. A trimming pattern, which is also a ground electrode, is provided on the outermost layer surface of the laminated capacitive element (9), and this surface is the case side, and the opposite outer electrode, which is the opposite outermost layer surface, has a counter electrode. The laminated capacitive element (9) was arranged so as to be on the copper plate (5) side.

The resistive element (7) is a laminated capacitive element (8)
A capacitor having the same thickness as that described above was prepared, fitted in the same manner as in the case of the stacked capacitive element (8), and fixed with solder. In addition,
It goes without saying that this ground terminal has the same potential as the lower metal case (1).

A barium ferrite disk (12), which is a permanent magnet, is adhered to the upper metal case (13), magnetization is adjusted by an electromagnet, and then, the lower metal case (1) is fitted to the isolator. did.

In turn, a method of forming an integrally molded product of the separately prepared copper plate (5) and resin (2) will be described in detail. A copper plate having a thickness of 0.2 mm is punched out and bent using a continuous press machine so as to have the developed surface shown in FIG. 2, and the vertical portion (21), the folded portion (22), and the external electrode (23) are formed. ) To form a copper plate (5).
In the same manner, a symmetrical copper plate, a copper plate for a dummy port, and the like were prepared.

These copper plates are integrally molded with resin using a transfer molding machine, and a garnet (1
1) and a hole for inserting the center conductor (3), the outer shape is the same size as the inside of the lower metal case (1), and the lower metal is formed except around the external electrode (23). An integrally molded product (2) having a concave portion on the lower surface that straddles the lower portion of the case (1) is obtained.

The lower metal case (1) was prepared by punching and bending an iron plate having a thickness of 0.2 mm using a continuous press, and then performing a high conductivity treatment on the surface. At this time, the window (1) is located at the place where the stacked capacitive elements (6, 8, 9) are to be arranged.
4, 15, 16). However, it is not necessary for these punched portions to be window-shaped, and the stacked capacitive elements (6, 8,
As long as 9) can be supported, the shape may be open to the outside.

The performance of the isolator assembled as described above is measured using a network analyzer, and the stacked capacitive element (6,
The capacitance patterns of 8 and 9) were trimmed and adjusted to achieve the target characteristics. Trimming was performed by rotating a resin-bonded grindstone with a sharp tip at high speed and pressing it against the part to be removed.

(Confirmation of Results) The outer shape of the prepared isolator is the same as the conventional one in height, and the width is about 1 mm each.
That is, it was reduced by about 15%. This is the effect of using a thin stacked capacitive element.

The number of parts was greatly reduced, and a great economic effect was obtained. One copper plate, external electrode, lead-out wiring to the external electrode, relay wire from the central conductor extension to the lead-out wiring on the left, opposing electrode of the capacitive element, relay from the opposing electrode of the capacitive element to the lead-out wiring on the left Wires and the like become unnecessary, and the same effect was obtained for other copper plates. Due to such a reduction in the number of parts, the man-hour for soldering work is 10 to 2 times.
It decreased by 0% and the quality variation also decreased.

The trimming is easy and the adjustment man-hour is about 1
/ 3. Moreover, the average value of the insertion loss is 0.
It also improved by 22 dB. This is because the adjustment accuracy has been increased, the above-mentioned relay parts which are likely to cause a loss have been reduced, the above-described soldering work which is likely to cause a loss has been reduced, and the garnet can be easily and accurately arranged. It is caused by things that have become impossible.

The chips generated during the trimming are not scattered inside the parts. Therefore, it is very significant also in terms of reliability in preventing a short circuit accident of parts. Further, even in a 24-hour vibration test using a vibration tester, there was no deterioration of various characteristics, and a significant improvement was obtained. This is because the displacement of wiring and the like hardly occurs even when strong vibration is applied by integrally molding the above-described copper plate and resin, and the stability of component arrangement is dramatically improved.

[0045]

The lumped constant type isolator for mobile communication equipment has obtained the following effects by applying the present invention. The product has become smaller. The number of parts has been greatly reduced.
The displacement due to the soldering work has been reduced. I became more resistant to vibration. Short circuit was prevented and reliability was improved. Capacity adjustment is now easy and precise. A product with excellent performance and little variation was obtained.

As a result, automation and mechanization of the manufacturing process became possible. Improvements in productivity and production efficiency were significant, contributing significantly to a reduction in manufacturing costs.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an isolator according to one embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the isolator according to one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Lower metal case 2 Resin 3 Center conductor 5 Conductor plate (copper plate) 9 Stacked capacitive element 11 Garnet (microwave ferrite) 12 Permanent magnet

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akinori Misawa 70-2, Minamisakae-cho, Tottori-shi, Tottori Hitachi Metals Co., Ltd. Inside the Tottori Plant (72) Inventor Koji Ichikawa 5200, Mitsagiri, Kumagaya-shi, Saitama Hitachi, Ltd. Inside the Magnetic Materials Research Laboratory (72) Inventor Shiro Murakami 5200 Mikajiri, Kumagaya City, Saitama Prefecture Inside the Magnetic Materials Research Laboratory, Hitachi Metals Co., Ltd.

Claims (8)

[Claims] 1. An isolator having a metal case, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, and a resistance element, wherein the semi-fixed capacitance element is fixed to the metal case, and the metal case has a notch. And a capacitance adjusting section of the semi-fixed capacitive element is disposed so as to be exposed through the notch. 2. An isolator having a metal case, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, and a resistance element, wherein the semi-fixed capacitance element is fixed to the metal case at a ground potential. Has a cutout portion, and the capacitance adjustment portion of the semi-fixed capacitance element is disposed so as to be exposed through the cutout portion, and the capacitance adjustment portion of the semi-fixed capacitance element is a ground-side electrode, and An isolator, wherein the fixed capacitance element is trimming of the ground side electrode performed by the capacitance adjustment means through the cutout portion. 3. An isolator having a metal case, a permanent magnet, a center conductor, a microwave ferrite, a laminated capacitive element, a resistive element, and a conductive plate, wherein the laminated capacitive element has a laminated surface of the microwave ferrite. The isolator is arranged so that it may become a plane parallel to the central axis of the isolator. 4. An isolator having a metal case, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, and a resistance element, wherein the metal case at the ground potential has a cutout, and the semi-fixed capacitance element has a notch. The capacitance adjusting portion is a ground electrode, and the conductor plate is an external terminal of the isolator and is electrically connected to the center conductor and an opposite external electrode of the semi-fixed capacitance element. Isolator. 5. An isolator having a metal case, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, a resistance element, and a conductor plate, wherein the metal case having a ground potential has a cutout portion, The capacitance element has a capacitance adjustment portion serving as a ground electrode, and the conductor plate serves as an external terminal of the isolator and the center conductor, the opposite external electrode of the semi-fixed capacitance element, and one electrode of the resistance element. An isolator electrically connected, and the other electrode of the resistance element is fixed to and electrically connected to the metal case. 6. An isolator having a metal case, a permanent magnet, a center conductor, a microwave ferrite, a semi-fixed capacitance element, a resistance element, and a conductor plate, wherein the conductor plate is an external terminal of the isolator and is connected to the center conductor. The semi-fixed capacitive element is electrically connected to the opposing external electrode, and the conductor plate is formed integrally with resin, and the external terminal of the isolator, the center conductor, and the semi-fixed capacitive element An isolator characterized by being covered with the resin only at a portion excluding an electrical connection portion with an opposing external electrode. 7. The isolator according to claim 6, wherein the resin has a step, and the semi-fixed capacitance element is mounted on the step. 8. The method according to claim 6, wherein the resin is disposed in contact with an outer periphery of the microwave ferrite.
8. The isolator according to any one of 7.